ASoC: Set idle_bias_off flag in snd_soc_codec_driver

Since commit 33c5f969 "ASoC: Allow idle_bias_off to be specified in CODEC
drivers", now we can set idle_bias_off flag in struct snd_soc_codec_driver
for devices can unconditionally support idle_bias_off.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8804.c b/sound/soc/codecs/wm8804.c
index 8abe375..7ee8dcf 100644
--- a/sound/soc/codecs/wm8804.c
+++ b/sound/soc/codecs/wm8804.c
@@ -549,7 +549,6 @@
 
 	wm8804 = snd_soc_codec_get_drvdata(codec);
 
-	codec->dapm.idle_bias_off = 1;
 	codec->control_data = wm8804->regmap;
 
 	ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
@@ -678,6 +677,7 @@
 	.suspend = wm8804_suspend,
 	.resume = wm8804_resume,
 	.set_bias_level = wm8804_set_bias_level,
+	.idle_bias_off = true,
 
 	.controls = wm8804_snd_controls,
 	.num_controls = ARRAY_SIZE(wm8804_snd_controls),